Antonyms of adv involuntarily

1 sense of involuntarily

Sense 1
involuntarily -- (against your will; "he was involuntarily held against his will")
       Antonym of voluntarily (Sense 1)
      => voluntarily -- (out of your own free will; "he voluntarily submitted to the fingerprinting")

Synonyms of adv involuntarily

1 sense of involuntarily

Sense 1
involuntarily -- (against your will; "he was involuntarily held against his will")